US2875896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of concentrating columbium minerals by froth flotation
Assignee: Kennecott Corp
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Filing: 1957-10-10
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Granted: 1959-03-03
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Expires: 1977-10-10
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Last
- 👤 Kent F Marquardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:43
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
IN A PROCESS OF FROTH FLOTATION FOR THE SEPARATION COLUMBIUM MINERALS FROM OTHER CONSTITUENTS OF A COLUMBIUM ORE, THE STEPS OF AGITATING AND AERATING AN AQUEOUS PULP CONTAINING SAID COLUMBIUM ORE AND 8QUINOLINOL, THE LATTER SERVING AS A COLLECTOR REAGENT SELECTIVE TO COLUMBIUM MINERALS; AND RECOVERING THE RESULTING FROTH AS A COLUMBIUM CONCENTRATE.
Claim 2
Dependent Claim
53 words
IN A PROCESS OF FROTH FLOTATION FOR THE SEPARATION COLUMBIUM MINERALS FROM OTHER CONSTITUENTS OF A COLUMBIUM ORE, THE STEPS OF AGITATING AND AERATING AN AQUEOUS PULP CONTAINING SAID COLUMBIUM ORE AND 8QUINOLINOL, THE LATTER SERVING AS A COLLECTOR REAGENT SELECTIVE TO COLUMBIUM MINERALS; AND RECOVERING THE RESULTING FROTH AS A COLUMBIUM CONCENTRATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |